On the Files tab, under the Source Package tree, select your option tree
by expanding "nxm", then "train" (where "train" is your option tree).
Right-click on "mcr", and select New -> Other..., then
in the window that appears select WindowBuilder -> Swing Designer -> JFrame.
For the Class Name, enter the name of the macro ("graphicslab2") that the
GUI form will use (the name should be in lower-case and does not
include a .mm extension), then press Finish button.